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Arf GTPases and their effectors: assembling multivalent membrane-binding platforms.

Jacqueline Cherfils1

  • 1Laboratoire d'Enzymologie et Biochimie Structurales, Centre de Recherche de Gif, CNRS, 91198 Gif-sur-Yvette cedex, France.

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|December 3, 2014
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Summary
This summary is machine-generated.

ADP-ribosylation factor (Arf) GTPases regulate membrane traffic by forming versatile, multivalent platforms. These platforms bind effectors to membranes, enabling diverse cellular functions.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • ADP-ribosylation factor (Arf) GTPases are crucial regulators of membrane traffic and organelle structure in eukaryotic cells.
  • Arf GTPases recruit a wide array of effectors involved in vesicular transport, lipid sorting, and membrane tethering.
  • Bacterial pathogens can hijack Arf functions to manipulate host cell processes.

Purpose of the Study:

  • To investigate the structural basis of Arf GTPase effector recognition.
  • To understand the common principles governing Arf/effector complex formation at membranes.
  • To elucidate how Arf GTPases facilitate diverse membrane-localized functions.

Main Methods:

  • Analysis of available structural data for Arf GTPase and effector complexes (Arf1, Arf6, Arl1).
  • Comparative analysis of protein-protein and protein-membrane interaction interfaces.
  • Functional characterization of Arf/effector complex assembly and regulation.

Main Results:

  • Arf GTPases do not recognize specific effector structures; instead, they bind effectors with diverse structures.
  • Arf/effector complexes are characterized by multiple, varied contacts with membranes.
  • Arf GTPases assemble multivalent membrane-binding platforms that optimally orient and regulate effectors.

Conclusions:

  • The primary function of Arf GTPases is to create adaptable, multivalent platforms for effector recruitment and membrane localization.
  • These platforms enable precise regulation of effectors, leading to a wide range of membrane-associated cellular activities.
  • Understanding Arf GTPase function provides insights into fundamental mechanisms of membrane trafficking and organelle organization.